CVE-2025-30360

webpack-dev-server users' source code may be stolen when they access a malicious web site with non-Chromium based browser

Description

webpack-dev-server allows users to use webpack with a development server that provides live reloading. Prior to version 5.2.1, webpack-dev-server users' source code may be stolen when you access a malicious web site with non-Chromium based browser. The `Origin` header is checked to prevent Cross-site WebSocket hijacking from happening, which was reported by CVE-2018-14732. But webpack-dev-server always allows IP address `Origin` headers. This allows websites that are served on IP addresses to connect WebSocket. An attacker can obtain source code via a method similar to that used to exploit CVE-2018-14732. Version 5.2.1 contains a patch for the issue.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Affected: webpack webpack-dev-server
Published at:
Updated at:

References

Link Tags
https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-9jgg-88mc-972h
https://github.com/webpack/webpack-dev-server/commit/5c9378bb01276357d7af208a0856ca2163db188e
https://github.com/webpack/webpack-dev-server/commit/72efaab83381a0e1c4914adf401cbd210b7de7eb
https://github.com/webpack/webpack-dev-server/blob/55220a800ba4e30dbde2d98785ecf4c80b32f711/lib/Server.js#L3113-L3127

Frequently Asked Questions

What is the severity of CVE-2025-30360?
CVE-2025-30360 has been scored as a medium severity vulnerability.
How to fix CVE-2025-30360?
To fix CVE-2025-30360, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-30360 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-30360 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-30360?
CVE-2025-30360 affects webpack webpack-dev-server.
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